1 #include <linux/ceph/ceph_debug.h> 2 3 #include <linux/module.h> 4 #include <linux/fs.h> 5 #include <linux/slab.h> 6 #include <linux/string.h> 7 #include <linux/uaccess.h> 8 #include <linux/kernel.h> 9 #include <linux/namei.h> 10 #include <linux/writeback.h> 11 #include <linux/vmalloc.h> 12 13 #include "super.h" 14 #include "mds_client.h" 15 #include "cache.h" 16 #include <linux/ceph/decode.h> 17 18 /* 19 * Ceph inode operations 20 * 21 * Implement basic inode helpers (get, alloc) and inode ops (getattr, 22 * setattr, etc.), xattr helpers, and helpers for assimilating 23 * metadata returned by the MDS into our cache. 24 * 25 * Also define helpers for doing asynchronous writeback, invalidation, 26 * and truncation for the benefit of those who can't afford to block 27 * (typically because they are in the message handler path). 28 */ 29 30 static const struct inode_operations ceph_symlink_iops; 31 32 static void ceph_invalidate_work(struct work_struct *work); 33 static void ceph_writeback_work(struct work_struct *work); 34 static void ceph_vmtruncate_work(struct work_struct *work); 35 36 /* 37 * find or create an inode, given the ceph ino number 38 */ 39 static int ceph_set_ino_cb(struct inode *inode, void *data) 40 { 41 ceph_inode(inode)->i_vino = *(struct ceph_vino *)data; 42 inode->i_ino = ceph_vino_to_ino(*(struct ceph_vino *)data); 43 return 0; 44 } 45 46 struct inode *ceph_get_inode(struct super_block *sb, struct ceph_vino vino) 47 { 48 struct inode *inode; 49 ino_t t = ceph_vino_to_ino(vino); 50 51 inode = iget5_locked(sb, t, ceph_ino_compare, ceph_set_ino_cb, &vino); 52 if (inode == NULL) 53 return ERR_PTR(-ENOMEM); 54 if (inode->i_state & I_NEW) { 55 dout("get_inode created new inode %p %llx.%llx ino %llx\n", 56 inode, ceph_vinop(inode), (u64)inode->i_ino); 57 unlock_new_inode(inode); 58 } 59 60 dout("get_inode on %lu=%llx.%llx got %p\n", inode->i_ino, vino.ino, 61 vino.snap, inode); 62 return inode; 63 } 64 65 /* 66 * get/constuct snapdir inode for a given directory 67 */ 68 struct inode *ceph_get_snapdir(struct inode *parent) 69 { 70 struct ceph_vino vino = { 71 .ino = ceph_ino(parent), 72 .snap = CEPH_SNAPDIR, 73 }; 74 struct inode *inode = ceph_get_inode(parent->i_sb, vino); 75 struct ceph_inode_info *ci = ceph_inode(inode); 76 77 BUG_ON(!S_ISDIR(parent->i_mode)); 78 if (IS_ERR(inode)) 79 return inode; 80 inode->i_mode = parent->i_mode; 81 inode->i_uid = parent->i_uid; 82 inode->i_gid = parent->i_gid; 83 inode->i_op = &ceph_dir_iops; 84 inode->i_fop = &ceph_dir_fops; 85 ci->i_snap_caps = CEPH_CAP_PIN; /* so we can open */ 86 ci->i_rbytes = 0; 87 return inode; 88 } 89 90 const struct inode_operations ceph_file_iops = { 91 .permission = ceph_permission, 92 .setattr = ceph_setattr, 93 .getattr = ceph_getattr, 94 .setxattr = ceph_setxattr, 95 .getxattr = ceph_getxattr, 96 .listxattr = ceph_listxattr, 97 .removexattr = ceph_removexattr, 98 .get_acl = ceph_get_acl, 99 }; 100 101 102 /* 103 * We use a 'frag tree' to keep track of the MDS's directory fragments 104 * for a given inode (usually there is just a single fragment). We 105 * need to know when a child frag is delegated to a new MDS, or when 106 * it is flagged as replicated, so we can direct our requests 107 * accordingly. 108 */ 109 110 /* 111 * find/create a frag in the tree 112 */ 113 static struct ceph_inode_frag *__get_or_create_frag(struct ceph_inode_info *ci, 114 u32 f) 115 { 116 struct rb_node **p; 117 struct rb_node *parent = NULL; 118 struct ceph_inode_frag *frag; 119 int c; 120 121 p = &ci->i_fragtree.rb_node; 122 while (*p) { 123 parent = *p; 124 frag = rb_entry(parent, struct ceph_inode_frag, node); 125 c = ceph_frag_compare(f, frag->frag); 126 if (c < 0) 127 p = &(*p)->rb_left; 128 else if (c > 0) 129 p = &(*p)->rb_right; 130 else 131 return frag; 132 } 133 134 frag = kmalloc(sizeof(*frag), GFP_NOFS); 135 if (!frag) { 136 pr_err("__get_or_create_frag ENOMEM on %p %llx.%llx " 137 "frag %x\n", &ci->vfs_inode, 138 ceph_vinop(&ci->vfs_inode), f); 139 return ERR_PTR(-ENOMEM); 140 } 141 frag->frag = f; 142 frag->split_by = 0; 143 frag->mds = -1; 144 frag->ndist = 0; 145 146 rb_link_node(&frag->node, parent, p); 147 rb_insert_color(&frag->node, &ci->i_fragtree); 148 149 dout("get_or_create_frag added %llx.%llx frag %x\n", 150 ceph_vinop(&ci->vfs_inode), f); 151 return frag; 152 } 153 154 /* 155 * find a specific frag @f 156 */ 157 struct ceph_inode_frag *__ceph_find_frag(struct ceph_inode_info *ci, u32 f) 158 { 159 struct rb_node *n = ci->i_fragtree.rb_node; 160 161 while (n) { 162 struct ceph_inode_frag *frag = 163 rb_entry(n, struct ceph_inode_frag, node); 164 int c = ceph_frag_compare(f, frag->frag); 165 if (c < 0) 166 n = n->rb_left; 167 else if (c > 0) 168 n = n->rb_right; 169 else 170 return frag; 171 } 172 return NULL; 173 } 174 175 /* 176 * Choose frag containing the given value @v. If @pfrag is 177 * specified, copy the frag delegation info to the caller if 178 * it is present. 179 */ 180 u32 ceph_choose_frag(struct ceph_inode_info *ci, u32 v, 181 struct ceph_inode_frag *pfrag, 182 int *found) 183 { 184 u32 t = ceph_frag_make(0, 0); 185 struct ceph_inode_frag *frag; 186 unsigned nway, i; 187 u32 n; 188 189 if (found) 190 *found = 0; 191 192 mutex_lock(&ci->i_fragtree_mutex); 193 while (1) { 194 WARN_ON(!ceph_frag_contains_value(t, v)); 195 frag = __ceph_find_frag(ci, t); 196 if (!frag) 197 break; /* t is a leaf */ 198 if (frag->split_by == 0) { 199 if (pfrag) 200 memcpy(pfrag, frag, sizeof(*pfrag)); 201 if (found) 202 *found = 1; 203 break; 204 } 205 206 /* choose child */ 207 nway = 1 << frag->split_by; 208 dout("choose_frag(%x) %x splits by %d (%d ways)\n", v, t, 209 frag->split_by, nway); 210 for (i = 0; i < nway; i++) { 211 n = ceph_frag_make_child(t, frag->split_by, i); 212 if (ceph_frag_contains_value(n, v)) { 213 t = n; 214 break; 215 } 216 } 217 BUG_ON(i == nway); 218 } 219 dout("choose_frag(%x) = %x\n", v, t); 220 221 mutex_unlock(&ci->i_fragtree_mutex); 222 return t; 223 } 224 225 /* 226 * Process dirfrag (delegation) info from the mds. Include leaf 227 * fragment in tree ONLY if ndist > 0. Otherwise, only 228 * branches/splits are included in i_fragtree) 229 */ 230 static int ceph_fill_dirfrag(struct inode *inode, 231 struct ceph_mds_reply_dirfrag *dirinfo) 232 { 233 struct ceph_inode_info *ci = ceph_inode(inode); 234 struct ceph_inode_frag *frag; 235 u32 id = le32_to_cpu(dirinfo->frag); 236 int mds = le32_to_cpu(dirinfo->auth); 237 int ndist = le32_to_cpu(dirinfo->ndist); 238 int i; 239 int err = 0; 240 241 mutex_lock(&ci->i_fragtree_mutex); 242 if (ndist == 0) { 243 /* no delegation info needed. */ 244 frag = __ceph_find_frag(ci, id); 245 if (!frag) 246 goto out; 247 if (frag->split_by == 0) { 248 /* tree leaf, remove */ 249 dout("fill_dirfrag removed %llx.%llx frag %x" 250 " (no ref)\n", ceph_vinop(inode), id); 251 rb_erase(&frag->node, &ci->i_fragtree); 252 kfree(frag); 253 } else { 254 /* tree branch, keep and clear */ 255 dout("fill_dirfrag cleared %llx.%llx frag %x" 256 " referral\n", ceph_vinop(inode), id); 257 frag->mds = -1; 258 frag->ndist = 0; 259 } 260 goto out; 261 } 262 263 264 /* find/add this frag to store mds delegation info */ 265 frag = __get_or_create_frag(ci, id); 266 if (IS_ERR(frag)) { 267 /* this is not the end of the world; we can continue 268 with bad/inaccurate delegation info */ 269 pr_err("fill_dirfrag ENOMEM on mds ref %llx.%llx fg %x\n", 270 ceph_vinop(inode), le32_to_cpu(dirinfo->frag)); 271 err = -ENOMEM; 272 goto out; 273 } 274 275 frag->mds = mds; 276 frag->ndist = min_t(u32, ndist, CEPH_MAX_DIRFRAG_REP); 277 for (i = 0; i < frag->ndist; i++) 278 frag->dist[i] = le32_to_cpu(dirinfo->dist[i]); 279 dout("fill_dirfrag %llx.%llx frag %x ndist=%d\n", 280 ceph_vinop(inode), frag->frag, frag->ndist); 281 282 out: 283 mutex_unlock(&ci->i_fragtree_mutex); 284 return err; 285 } 286 287 288 /* 289 * initialize a newly allocated inode. 290 */ 291 struct inode *ceph_alloc_inode(struct super_block *sb) 292 { 293 struct ceph_inode_info *ci; 294 int i; 295 296 ci = kmem_cache_alloc(ceph_inode_cachep, GFP_NOFS); 297 if (!ci) 298 return NULL; 299 300 dout("alloc_inode %p\n", &ci->vfs_inode); 301 302 spin_lock_init(&ci->i_ceph_lock); 303 304 ci->i_version = 0; 305 ci->i_time_warp_seq = 0; 306 ci->i_ceph_flags = 0; 307 atomic_set(&ci->i_release_count, 1); 308 atomic_set(&ci->i_complete_count, 0); 309 ci->i_symlink = NULL; 310 311 memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout)); 312 313 ci->i_fragtree = RB_ROOT; 314 mutex_init(&ci->i_fragtree_mutex); 315 316 ci->i_xattrs.blob = NULL; 317 ci->i_xattrs.prealloc_blob = NULL; 318 ci->i_xattrs.dirty = false; 319 ci->i_xattrs.index = RB_ROOT; 320 ci->i_xattrs.count = 0; 321 ci->i_xattrs.names_size = 0; 322 ci->i_xattrs.vals_size = 0; 323 ci->i_xattrs.version = 0; 324 ci->i_xattrs.index_version = 0; 325 326 ci->i_caps = RB_ROOT; 327 ci->i_auth_cap = NULL; 328 ci->i_dirty_caps = 0; 329 ci->i_flushing_caps = 0; 330 INIT_LIST_HEAD(&ci->i_dirty_item); 331 INIT_LIST_HEAD(&ci->i_flushing_item); 332 ci->i_cap_flush_seq = 0; 333 ci->i_cap_flush_last_tid = 0; 334 memset(&ci->i_cap_flush_tid, 0, sizeof(ci->i_cap_flush_tid)); 335 init_waitqueue_head(&ci->i_cap_wq); 336 ci->i_hold_caps_min = 0; 337 ci->i_hold_caps_max = 0; 338 INIT_LIST_HEAD(&ci->i_cap_delay_list); 339 INIT_LIST_HEAD(&ci->i_cap_snaps); 340 ci->i_head_snapc = NULL; 341 ci->i_snap_caps = 0; 342 ci->i_cap_exporting_issued = 0; 343 344 for (i = 0; i < CEPH_FILE_MODE_NUM; i++) 345 ci->i_nr_by_mode[i] = 0; 346 347 mutex_init(&ci->i_truncate_mutex); 348 ci->i_truncate_seq = 0; 349 ci->i_truncate_size = 0; 350 ci->i_truncate_pending = 0; 351 352 ci->i_max_size = 0; 353 ci->i_reported_size = 0; 354 ci->i_wanted_max_size = 0; 355 ci->i_requested_max_size = 0; 356 357 ci->i_pin_ref = 0; 358 ci->i_rd_ref = 0; 359 ci->i_rdcache_ref = 0; 360 ci->i_wr_ref = 0; 361 ci->i_wb_ref = 0; 362 ci->i_wrbuffer_ref = 0; 363 ci->i_wrbuffer_ref_head = 0; 364 ci->i_shared_gen = 0; 365 ci->i_rdcache_gen = 0; 366 ci->i_rdcache_revoking = 0; 367 368 INIT_LIST_HEAD(&ci->i_unsafe_writes); 369 INIT_LIST_HEAD(&ci->i_unsafe_dirops); 370 spin_lock_init(&ci->i_unsafe_lock); 371 372 ci->i_snap_realm = NULL; 373 INIT_LIST_HEAD(&ci->i_snap_realm_item); 374 INIT_LIST_HEAD(&ci->i_snap_flush_item); 375 376 INIT_WORK(&ci->i_wb_work, ceph_writeback_work); 377 INIT_WORK(&ci->i_pg_inv_work, ceph_invalidate_work); 378 379 INIT_WORK(&ci->i_vmtruncate_work, ceph_vmtruncate_work); 380 381 ceph_fscache_inode_init(ci); 382 383 return &ci->vfs_inode; 384 } 385 386 static void ceph_i_callback(struct rcu_head *head) 387 { 388 struct inode *inode = container_of(head, struct inode, i_rcu); 389 struct ceph_inode_info *ci = ceph_inode(inode); 390 391 kmem_cache_free(ceph_inode_cachep, ci); 392 } 393 394 void ceph_destroy_inode(struct inode *inode) 395 { 396 struct ceph_inode_info *ci = ceph_inode(inode); 397 struct ceph_inode_frag *frag; 398 struct rb_node *n; 399 400 dout("destroy_inode %p ino %llx.%llx\n", inode, ceph_vinop(inode)); 401 402 ceph_fscache_unregister_inode_cookie(ci); 403 404 ceph_queue_caps_release(inode); 405 406 /* 407 * we may still have a snap_realm reference if there are stray 408 * caps in i_cap_exporting_issued or i_snap_caps. 409 */ 410 if (ci->i_snap_realm) { 411 struct ceph_mds_client *mdsc = 412 ceph_sb_to_client(ci->vfs_inode.i_sb)->mdsc; 413 struct ceph_snap_realm *realm = ci->i_snap_realm; 414 415 dout(" dropping residual ref to snap realm %p\n", realm); 416 spin_lock(&realm->inodes_with_caps_lock); 417 list_del_init(&ci->i_snap_realm_item); 418 spin_unlock(&realm->inodes_with_caps_lock); 419 ceph_put_snap_realm(mdsc, realm); 420 } 421 422 kfree(ci->i_symlink); 423 while ((n = rb_first(&ci->i_fragtree)) != NULL) { 424 frag = rb_entry(n, struct ceph_inode_frag, node); 425 rb_erase(n, &ci->i_fragtree); 426 kfree(frag); 427 } 428 429 __ceph_destroy_xattrs(ci); 430 if (ci->i_xattrs.blob) 431 ceph_buffer_put(ci->i_xattrs.blob); 432 if (ci->i_xattrs.prealloc_blob) 433 ceph_buffer_put(ci->i_xattrs.prealloc_blob); 434 435 call_rcu(&inode->i_rcu, ceph_i_callback); 436 } 437 438 int ceph_drop_inode(struct inode *inode) 439 { 440 /* 441 * Positve dentry and corresponding inode are always accompanied 442 * in MDS reply. So no need to keep inode in the cache after 443 * dropping all its aliases. 444 */ 445 return 1; 446 } 447 448 /* 449 * Helpers to fill in size, ctime, mtime, and atime. We have to be 450 * careful because either the client or MDS may have more up to date 451 * info, depending on which capabilities are held, and whether 452 * time_warp_seq or truncate_seq have increased. (Ordinarily, mtime 453 * and size are monotonically increasing, except when utimes() or 454 * truncate() increments the corresponding _seq values.) 455 */ 456 int ceph_fill_file_size(struct inode *inode, int issued, 457 u32 truncate_seq, u64 truncate_size, u64 size) 458 { 459 struct ceph_inode_info *ci = ceph_inode(inode); 460 int queue_trunc = 0; 461 462 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) > 0 || 463 (truncate_seq == ci->i_truncate_seq && size > inode->i_size)) { 464 dout("size %lld -> %llu\n", inode->i_size, size); 465 inode->i_size = size; 466 inode->i_blocks = (size + (1<<9) - 1) >> 9; 467 ci->i_reported_size = size; 468 if (truncate_seq != ci->i_truncate_seq) { 469 dout("truncate_seq %u -> %u\n", 470 ci->i_truncate_seq, truncate_seq); 471 ci->i_truncate_seq = truncate_seq; 472 473 /* the MDS should have revoked these caps */ 474 WARN_ON_ONCE(issued & (CEPH_CAP_FILE_EXCL | 475 CEPH_CAP_FILE_RD | 476 CEPH_CAP_FILE_WR | 477 CEPH_CAP_FILE_LAZYIO)); 478 /* 479 * If we hold relevant caps, or in the case where we're 480 * not the only client referencing this file and we 481 * don't hold those caps, then we need to check whether 482 * the file is either opened or mmaped 483 */ 484 if ((issued & (CEPH_CAP_FILE_CACHE| 485 CEPH_CAP_FILE_BUFFER)) || 486 mapping_mapped(inode->i_mapping) || 487 __ceph_caps_file_wanted(ci)) { 488 ci->i_truncate_pending++; 489 queue_trunc = 1; 490 } 491 } 492 } 493 if (ceph_seq_cmp(truncate_seq, ci->i_truncate_seq) >= 0 && 494 ci->i_truncate_size != truncate_size) { 495 dout("truncate_size %lld -> %llu\n", ci->i_truncate_size, 496 truncate_size); 497 ci->i_truncate_size = truncate_size; 498 } 499 500 if (queue_trunc) 501 ceph_fscache_invalidate(inode); 502 503 return queue_trunc; 504 } 505 506 void ceph_fill_file_time(struct inode *inode, int issued, 507 u64 time_warp_seq, struct timespec *ctime, 508 struct timespec *mtime, struct timespec *atime) 509 { 510 struct ceph_inode_info *ci = ceph_inode(inode); 511 int warn = 0; 512 513 if (issued & (CEPH_CAP_FILE_EXCL| 514 CEPH_CAP_FILE_WR| 515 CEPH_CAP_FILE_BUFFER| 516 CEPH_CAP_AUTH_EXCL| 517 CEPH_CAP_XATTR_EXCL)) { 518 if (timespec_compare(ctime, &inode->i_ctime) > 0) { 519 dout("ctime %ld.%09ld -> %ld.%09ld inc w/ cap\n", 520 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 521 ctime->tv_sec, ctime->tv_nsec); 522 inode->i_ctime = *ctime; 523 } 524 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) > 0) { 525 /* the MDS did a utimes() */ 526 dout("mtime %ld.%09ld -> %ld.%09ld " 527 "tw %d -> %d\n", 528 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 529 mtime->tv_sec, mtime->tv_nsec, 530 ci->i_time_warp_seq, (int)time_warp_seq); 531 532 inode->i_mtime = *mtime; 533 inode->i_atime = *atime; 534 ci->i_time_warp_seq = time_warp_seq; 535 } else if (time_warp_seq == ci->i_time_warp_seq) { 536 /* nobody did utimes(); take the max */ 537 if (timespec_compare(mtime, &inode->i_mtime) > 0) { 538 dout("mtime %ld.%09ld -> %ld.%09ld inc\n", 539 inode->i_mtime.tv_sec, 540 inode->i_mtime.tv_nsec, 541 mtime->tv_sec, mtime->tv_nsec); 542 inode->i_mtime = *mtime; 543 } 544 if (timespec_compare(atime, &inode->i_atime) > 0) { 545 dout("atime %ld.%09ld -> %ld.%09ld inc\n", 546 inode->i_atime.tv_sec, 547 inode->i_atime.tv_nsec, 548 atime->tv_sec, atime->tv_nsec); 549 inode->i_atime = *atime; 550 } 551 } else if (issued & CEPH_CAP_FILE_EXCL) { 552 /* we did a utimes(); ignore mds values */ 553 } else { 554 warn = 1; 555 } 556 } else { 557 /* we have no write|excl caps; whatever the MDS says is true */ 558 if (ceph_seq_cmp(time_warp_seq, ci->i_time_warp_seq) >= 0) { 559 inode->i_ctime = *ctime; 560 inode->i_mtime = *mtime; 561 inode->i_atime = *atime; 562 ci->i_time_warp_seq = time_warp_seq; 563 } else { 564 warn = 1; 565 } 566 } 567 if (warn) /* time_warp_seq shouldn't go backwards */ 568 dout("%p mds time_warp_seq %llu < %u\n", 569 inode, time_warp_seq, ci->i_time_warp_seq); 570 } 571 572 /* 573 * Populate an inode based on info from mds. May be called on new or 574 * existing inodes. 575 */ 576 static int fill_inode(struct inode *inode, 577 struct ceph_mds_reply_info_in *iinfo, 578 struct ceph_mds_reply_dirfrag *dirinfo, 579 struct ceph_mds_session *session, 580 unsigned long ttl_from, int cap_fmode, 581 struct ceph_cap_reservation *caps_reservation) 582 { 583 struct ceph_mds_reply_inode *info = iinfo->in; 584 struct ceph_inode_info *ci = ceph_inode(inode); 585 int i; 586 int issued = 0, implemented; 587 struct timespec mtime, atime, ctime; 588 u32 nsplits; 589 struct ceph_inode_frag *frag; 590 struct rb_node *rb_node; 591 struct ceph_buffer *xattr_blob = NULL; 592 int err = 0; 593 int queue_trunc = 0; 594 595 dout("fill_inode %p ino %llx.%llx v %llu had %llu\n", 596 inode, ceph_vinop(inode), le64_to_cpu(info->version), 597 ci->i_version); 598 599 /* 600 * prealloc xattr data, if it looks like we'll need it. only 601 * if len > 4 (meaning there are actually xattrs; the first 4 602 * bytes are the xattr count). 603 */ 604 if (iinfo->xattr_len > 4) { 605 xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS); 606 if (!xattr_blob) 607 pr_err("fill_inode ENOMEM xattr blob %d bytes\n", 608 iinfo->xattr_len); 609 } 610 611 spin_lock(&ci->i_ceph_lock); 612 613 /* 614 * provided version will be odd if inode value is projected, 615 * even if stable. skip the update if we have newer stable 616 * info (ours>=theirs, e.g. due to racing mds replies), unless 617 * we are getting projected (unstable) info (in which case the 618 * version is odd, and we want ours>theirs). 619 * us them 620 * 2 2 skip 621 * 3 2 skip 622 * 3 3 update 623 */ 624 if (le64_to_cpu(info->version) > 0 && 625 (ci->i_version & ~1) >= le64_to_cpu(info->version)) 626 goto no_change; 627 628 issued = __ceph_caps_issued(ci, &implemented); 629 issued |= implemented | __ceph_caps_dirty(ci); 630 631 /* update inode */ 632 ci->i_version = le64_to_cpu(info->version); 633 inode->i_version++; 634 inode->i_rdev = le32_to_cpu(info->rdev); 635 636 if ((issued & CEPH_CAP_AUTH_EXCL) == 0) { 637 inode->i_mode = le32_to_cpu(info->mode); 638 inode->i_uid = make_kuid(&init_user_ns, le32_to_cpu(info->uid)); 639 inode->i_gid = make_kgid(&init_user_ns, le32_to_cpu(info->gid)); 640 dout("%p mode 0%o uid.gid %d.%d\n", inode, inode->i_mode, 641 from_kuid(&init_user_ns, inode->i_uid), 642 from_kgid(&init_user_ns, inode->i_gid)); 643 } 644 645 if ((issued & CEPH_CAP_LINK_EXCL) == 0) 646 set_nlink(inode, le32_to_cpu(info->nlink)); 647 648 /* be careful with mtime, atime, size */ 649 ceph_decode_timespec(&atime, &info->atime); 650 ceph_decode_timespec(&mtime, &info->mtime); 651 ceph_decode_timespec(&ctime, &info->ctime); 652 queue_trunc = ceph_fill_file_size(inode, issued, 653 le32_to_cpu(info->truncate_seq), 654 le64_to_cpu(info->truncate_size), 655 le64_to_cpu(info->size)); 656 ceph_fill_file_time(inode, issued, 657 le32_to_cpu(info->time_warp_seq), 658 &ctime, &mtime, &atime); 659 660 /* only update max_size on auth cap */ 661 if ((info->cap.flags & CEPH_CAP_FLAG_AUTH) && 662 ci->i_max_size != le64_to_cpu(info->max_size)) { 663 dout("max_size %lld -> %llu\n", ci->i_max_size, 664 le64_to_cpu(info->max_size)); 665 ci->i_max_size = le64_to_cpu(info->max_size); 666 } 667 668 ci->i_layout = info->layout; 669 inode->i_blkbits = fls(le32_to_cpu(info->layout.fl_stripe_unit)) - 1; 670 671 /* xattrs */ 672 /* note that if i_xattrs.len <= 4, i_xattrs.data will still be NULL. */ 673 if ((issued & CEPH_CAP_XATTR_EXCL) == 0 && 674 le64_to_cpu(info->xattr_version) > ci->i_xattrs.version) { 675 if (ci->i_xattrs.blob) 676 ceph_buffer_put(ci->i_xattrs.blob); 677 ci->i_xattrs.blob = xattr_blob; 678 if (xattr_blob) 679 memcpy(ci->i_xattrs.blob->vec.iov_base, 680 iinfo->xattr_data, iinfo->xattr_len); 681 ci->i_xattrs.version = le64_to_cpu(info->xattr_version); 682 ceph_forget_all_cached_acls(inode); 683 xattr_blob = NULL; 684 } 685 686 inode->i_mapping->a_ops = &ceph_aops; 687 inode->i_mapping->backing_dev_info = 688 &ceph_sb_to_client(inode->i_sb)->backing_dev_info; 689 690 switch (inode->i_mode & S_IFMT) { 691 case S_IFIFO: 692 case S_IFBLK: 693 case S_IFCHR: 694 case S_IFSOCK: 695 init_special_inode(inode, inode->i_mode, inode->i_rdev); 696 inode->i_op = &ceph_file_iops; 697 break; 698 case S_IFREG: 699 inode->i_op = &ceph_file_iops; 700 inode->i_fop = &ceph_file_fops; 701 break; 702 case S_IFLNK: 703 inode->i_op = &ceph_symlink_iops; 704 if (!ci->i_symlink) { 705 u32 symlen = iinfo->symlink_len; 706 char *sym; 707 708 spin_unlock(&ci->i_ceph_lock); 709 710 err = -EINVAL; 711 if (WARN_ON(symlen != inode->i_size)) 712 goto out; 713 714 err = -ENOMEM; 715 sym = kstrndup(iinfo->symlink, symlen, GFP_NOFS); 716 if (!sym) 717 goto out; 718 719 spin_lock(&ci->i_ceph_lock); 720 if (!ci->i_symlink) 721 ci->i_symlink = sym; 722 else 723 kfree(sym); /* lost a race */ 724 } 725 break; 726 case S_IFDIR: 727 inode->i_op = &ceph_dir_iops; 728 inode->i_fop = &ceph_dir_fops; 729 730 ci->i_dir_layout = iinfo->dir_layout; 731 732 ci->i_files = le64_to_cpu(info->files); 733 ci->i_subdirs = le64_to_cpu(info->subdirs); 734 ci->i_rbytes = le64_to_cpu(info->rbytes); 735 ci->i_rfiles = le64_to_cpu(info->rfiles); 736 ci->i_rsubdirs = le64_to_cpu(info->rsubdirs); 737 ceph_decode_timespec(&ci->i_rctime, &info->rctime); 738 break; 739 default: 740 pr_err("fill_inode %llx.%llx BAD mode 0%o\n", 741 ceph_vinop(inode), inode->i_mode); 742 } 743 744 /* set dir completion flag? */ 745 if (S_ISDIR(inode->i_mode) && 746 ci->i_files == 0 && ci->i_subdirs == 0 && 747 ceph_snap(inode) == CEPH_NOSNAP && 748 (le32_to_cpu(info->cap.caps) & CEPH_CAP_FILE_SHARED) && 749 (issued & CEPH_CAP_FILE_EXCL) == 0 && 750 !__ceph_dir_is_complete(ci)) { 751 dout(" marking %p complete (empty)\n", inode); 752 __ceph_dir_set_complete(ci, atomic_read(&ci->i_release_count)); 753 ci->i_max_offset = 2; 754 } 755 no_change: 756 spin_unlock(&ci->i_ceph_lock); 757 758 /* queue truncate if we saw i_size decrease */ 759 if (queue_trunc) 760 ceph_queue_vmtruncate(inode); 761 762 /* populate frag tree */ 763 /* FIXME: move me up, if/when version reflects fragtree changes */ 764 nsplits = le32_to_cpu(info->fragtree.nsplits); 765 mutex_lock(&ci->i_fragtree_mutex); 766 rb_node = rb_first(&ci->i_fragtree); 767 for (i = 0; i < nsplits; i++) { 768 u32 id = le32_to_cpu(info->fragtree.splits[i].frag); 769 frag = NULL; 770 while (rb_node) { 771 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 772 if (ceph_frag_compare(frag->frag, id) >= 0) { 773 if (frag->frag != id) 774 frag = NULL; 775 else 776 rb_node = rb_next(rb_node); 777 break; 778 } 779 rb_node = rb_next(rb_node); 780 rb_erase(&frag->node, &ci->i_fragtree); 781 kfree(frag); 782 frag = NULL; 783 } 784 if (!frag) { 785 frag = __get_or_create_frag(ci, id); 786 if (IS_ERR(frag)) 787 continue; 788 } 789 frag->split_by = le32_to_cpu(info->fragtree.splits[i].by); 790 dout(" frag %x split by %d\n", frag->frag, frag->split_by); 791 } 792 while (rb_node) { 793 frag = rb_entry(rb_node, struct ceph_inode_frag, node); 794 rb_node = rb_next(rb_node); 795 rb_erase(&frag->node, &ci->i_fragtree); 796 kfree(frag); 797 } 798 mutex_unlock(&ci->i_fragtree_mutex); 799 800 /* were we issued a capability? */ 801 if (info->cap.caps) { 802 if (ceph_snap(inode) == CEPH_NOSNAP) { 803 ceph_add_cap(inode, session, 804 le64_to_cpu(info->cap.cap_id), 805 cap_fmode, 806 le32_to_cpu(info->cap.caps), 807 le32_to_cpu(info->cap.wanted), 808 le32_to_cpu(info->cap.seq), 809 le32_to_cpu(info->cap.mseq), 810 le64_to_cpu(info->cap.realm), 811 info->cap.flags, 812 caps_reservation); 813 } else { 814 spin_lock(&ci->i_ceph_lock); 815 dout(" %p got snap_caps %s\n", inode, 816 ceph_cap_string(le32_to_cpu(info->cap.caps))); 817 ci->i_snap_caps |= le32_to_cpu(info->cap.caps); 818 if (cap_fmode >= 0) 819 __ceph_get_fmode(ci, cap_fmode); 820 spin_unlock(&ci->i_ceph_lock); 821 } 822 } else if (cap_fmode >= 0) { 823 pr_warning("mds issued no caps on %llx.%llx\n", 824 ceph_vinop(inode)); 825 __ceph_get_fmode(ci, cap_fmode); 826 } 827 828 /* update delegation info? */ 829 if (dirinfo) 830 ceph_fill_dirfrag(inode, dirinfo); 831 832 err = 0; 833 834 out: 835 if (xattr_blob) 836 ceph_buffer_put(xattr_blob); 837 return err; 838 } 839 840 /* 841 * caller should hold session s_mutex. 842 */ 843 static void update_dentry_lease(struct dentry *dentry, 844 struct ceph_mds_reply_lease *lease, 845 struct ceph_mds_session *session, 846 unsigned long from_time) 847 { 848 struct ceph_dentry_info *di = ceph_dentry(dentry); 849 long unsigned duration = le32_to_cpu(lease->duration_ms); 850 long unsigned ttl = from_time + (duration * HZ) / 1000; 851 long unsigned half_ttl = from_time + (duration * HZ / 2) / 1000; 852 struct inode *dir; 853 854 /* only track leases on regular dentries */ 855 if (dentry->d_op != &ceph_dentry_ops) 856 return; 857 858 spin_lock(&dentry->d_lock); 859 dout("update_dentry_lease %p duration %lu ms ttl %lu\n", 860 dentry, duration, ttl); 861 862 /* make lease_rdcache_gen match directory */ 863 dir = dentry->d_parent->d_inode; 864 di->lease_shared_gen = ceph_inode(dir)->i_shared_gen; 865 866 if (duration == 0) 867 goto out_unlock; 868 869 if (di->lease_gen == session->s_cap_gen && 870 time_before(ttl, dentry->d_time)) 871 goto out_unlock; /* we already have a newer lease. */ 872 873 if (di->lease_session && di->lease_session != session) 874 goto out_unlock; 875 876 ceph_dentry_lru_touch(dentry); 877 878 if (!di->lease_session) 879 di->lease_session = ceph_get_mds_session(session); 880 di->lease_gen = session->s_cap_gen; 881 di->lease_seq = le32_to_cpu(lease->seq); 882 di->lease_renew_after = half_ttl; 883 di->lease_renew_from = 0; 884 dentry->d_time = ttl; 885 out_unlock: 886 spin_unlock(&dentry->d_lock); 887 return; 888 } 889 890 /* 891 * Set dentry's directory position based on the current dir's max, and 892 * order it in d_subdirs, so that dcache_readdir behaves. 893 * 894 * Always called under directory's i_mutex. 895 */ 896 static void ceph_set_dentry_offset(struct dentry *dn) 897 { 898 struct dentry *dir = dn->d_parent; 899 struct inode *inode = dir->d_inode; 900 struct ceph_inode_info *ci; 901 struct ceph_dentry_info *di; 902 903 BUG_ON(!inode); 904 905 ci = ceph_inode(inode); 906 di = ceph_dentry(dn); 907 908 spin_lock(&ci->i_ceph_lock); 909 if (!__ceph_dir_is_complete(ci)) { 910 spin_unlock(&ci->i_ceph_lock); 911 return; 912 } 913 di->offset = ceph_inode(inode)->i_max_offset++; 914 spin_unlock(&ci->i_ceph_lock); 915 916 spin_lock(&dir->d_lock); 917 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED); 918 list_move(&dn->d_u.d_child, &dir->d_subdirs); 919 dout("set_dentry_offset %p %lld (%p %p)\n", dn, di->offset, 920 dn->d_u.d_child.prev, dn->d_u.d_child.next); 921 spin_unlock(&dn->d_lock); 922 spin_unlock(&dir->d_lock); 923 } 924 925 /* 926 * splice a dentry to an inode. 927 * caller must hold directory i_mutex for this to be safe. 928 * 929 * we will only rehash the resulting dentry if @prehash is 930 * true; @prehash will be set to false (for the benefit of 931 * the caller) if we fail. 932 */ 933 static struct dentry *splice_dentry(struct dentry *dn, struct inode *in, 934 bool *prehash, bool set_offset) 935 { 936 struct dentry *realdn; 937 938 BUG_ON(dn->d_inode); 939 940 /* dn must be unhashed */ 941 if (!d_unhashed(dn)) 942 d_drop(dn); 943 realdn = d_materialise_unique(dn, in); 944 if (IS_ERR(realdn)) { 945 pr_err("splice_dentry error %ld %p inode %p ino %llx.%llx\n", 946 PTR_ERR(realdn), dn, in, ceph_vinop(in)); 947 if (prehash) 948 *prehash = false; /* don't rehash on error */ 949 dn = realdn; /* note realdn contains the error */ 950 goto out; 951 } else if (realdn) { 952 dout("dn %p (%d) spliced with %p (%d) " 953 "inode %p ino %llx.%llx\n", 954 dn, d_count(dn), 955 realdn, d_count(realdn), 956 realdn->d_inode, ceph_vinop(realdn->d_inode)); 957 dput(dn); 958 dn = realdn; 959 } else { 960 BUG_ON(!ceph_dentry(dn)); 961 dout("dn %p attached to %p ino %llx.%llx\n", 962 dn, dn->d_inode, ceph_vinop(dn->d_inode)); 963 } 964 if ((!prehash || *prehash) && d_unhashed(dn)) 965 d_rehash(dn); 966 if (set_offset) 967 ceph_set_dentry_offset(dn); 968 out: 969 return dn; 970 } 971 972 /* 973 * Incorporate results into the local cache. This is either just 974 * one inode, or a directory, dentry, and possibly linked-to inode (e.g., 975 * after a lookup). 976 * 977 * A reply may contain 978 * a directory inode along with a dentry. 979 * and/or a target inode 980 * 981 * Called with snap_rwsem (read). 982 */ 983 int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req, 984 struct ceph_mds_session *session) 985 { 986 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 987 struct inode *in = NULL; 988 struct ceph_mds_reply_inode *ininfo; 989 struct ceph_vino vino; 990 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 991 int err = 0; 992 993 dout("fill_trace %p is_dentry %d is_target %d\n", req, 994 rinfo->head->is_dentry, rinfo->head->is_target); 995 996 #if 0 997 /* 998 * Debugging hook: 999 * 1000 * If we resend completed ops to a recovering mds, we get no 1001 * trace. Since that is very rare, pretend this is the case 1002 * to ensure the 'no trace' handlers in the callers behave. 1003 * 1004 * Fill in inodes unconditionally to avoid breaking cap 1005 * invariants. 1006 */ 1007 if (rinfo->head->op & CEPH_MDS_OP_WRITE) { 1008 pr_info("fill_trace faking empty trace on %lld %s\n", 1009 req->r_tid, ceph_mds_op_name(rinfo->head->op)); 1010 if (rinfo->head->is_dentry) { 1011 rinfo->head->is_dentry = 0; 1012 err = fill_inode(req->r_locked_dir, 1013 &rinfo->diri, rinfo->dirfrag, 1014 session, req->r_request_started, -1); 1015 } 1016 if (rinfo->head->is_target) { 1017 rinfo->head->is_target = 0; 1018 ininfo = rinfo->targeti.in; 1019 vino.ino = le64_to_cpu(ininfo->ino); 1020 vino.snap = le64_to_cpu(ininfo->snapid); 1021 in = ceph_get_inode(sb, vino); 1022 err = fill_inode(in, &rinfo->targeti, NULL, 1023 session, req->r_request_started, 1024 req->r_fmode); 1025 iput(in); 1026 } 1027 } 1028 #endif 1029 1030 if (!rinfo->head->is_target && !rinfo->head->is_dentry) { 1031 dout("fill_trace reply is empty!\n"); 1032 if (rinfo->head->result == 0 && req->r_locked_dir) 1033 ceph_invalidate_dir_request(req); 1034 return 0; 1035 } 1036 1037 if (rinfo->head->is_dentry) { 1038 struct inode *dir = req->r_locked_dir; 1039 1040 if (dir) { 1041 err = fill_inode(dir, &rinfo->diri, rinfo->dirfrag, 1042 session, req->r_request_started, -1, 1043 &req->r_caps_reservation); 1044 if (err < 0) 1045 return err; 1046 } else { 1047 WARN_ON_ONCE(1); 1048 } 1049 } 1050 1051 if (rinfo->head->is_target) { 1052 vino.ino = le64_to_cpu(rinfo->targeti.in->ino); 1053 vino.snap = le64_to_cpu(rinfo->targeti.in->snapid); 1054 1055 in = ceph_get_inode(sb, vino); 1056 if (IS_ERR(in)) { 1057 err = PTR_ERR(in); 1058 goto done; 1059 } 1060 req->r_target_inode = in; 1061 1062 err = fill_inode(in, &rinfo->targeti, NULL, 1063 session, req->r_request_started, 1064 (le32_to_cpu(rinfo->head->result) == 0) ? 1065 req->r_fmode : -1, 1066 &req->r_caps_reservation); 1067 if (err < 0) { 1068 pr_err("fill_inode badness %p %llx.%llx\n", 1069 in, ceph_vinop(in)); 1070 goto done; 1071 } 1072 } 1073 1074 /* 1075 * ignore null lease/binding on snapdir ENOENT, or else we 1076 * will have trouble splicing in the virtual snapdir later 1077 */ 1078 if (rinfo->head->is_dentry && !req->r_aborted && 1079 req->r_locked_dir && 1080 (rinfo->head->is_target || strncmp(req->r_dentry->d_name.name, 1081 fsc->mount_options->snapdir_name, 1082 req->r_dentry->d_name.len))) { 1083 /* 1084 * lookup link rename : null -> possibly existing inode 1085 * mknod symlink mkdir : null -> new inode 1086 * unlink : linked -> null 1087 */ 1088 struct inode *dir = req->r_locked_dir; 1089 struct dentry *dn = req->r_dentry; 1090 bool have_dir_cap, have_lease; 1091 1092 BUG_ON(!dn); 1093 BUG_ON(!dir); 1094 BUG_ON(dn->d_parent->d_inode != dir); 1095 BUG_ON(ceph_ino(dir) != 1096 le64_to_cpu(rinfo->diri.in->ino)); 1097 BUG_ON(ceph_snap(dir) != 1098 le64_to_cpu(rinfo->diri.in->snapid)); 1099 1100 /* do we have a lease on the whole dir? */ 1101 have_dir_cap = 1102 (le32_to_cpu(rinfo->diri.in->cap.caps) & 1103 CEPH_CAP_FILE_SHARED); 1104 1105 /* do we have a dn lease? */ 1106 have_lease = have_dir_cap || 1107 le32_to_cpu(rinfo->dlease->duration_ms); 1108 if (!have_lease) 1109 dout("fill_trace no dentry lease or dir cap\n"); 1110 1111 /* rename? */ 1112 if (req->r_old_dentry && req->r_op == CEPH_MDS_OP_RENAME) { 1113 dout(" src %p '%.*s' dst %p '%.*s'\n", 1114 req->r_old_dentry, 1115 req->r_old_dentry->d_name.len, 1116 req->r_old_dentry->d_name.name, 1117 dn, dn->d_name.len, dn->d_name.name); 1118 dout("fill_trace doing d_move %p -> %p\n", 1119 req->r_old_dentry, dn); 1120 1121 d_move(req->r_old_dentry, dn); 1122 dout(" src %p '%.*s' dst %p '%.*s'\n", 1123 req->r_old_dentry, 1124 req->r_old_dentry->d_name.len, 1125 req->r_old_dentry->d_name.name, 1126 dn, dn->d_name.len, dn->d_name.name); 1127 1128 /* ensure target dentry is invalidated, despite 1129 rehashing bug in vfs_rename_dir */ 1130 ceph_invalidate_dentry_lease(dn); 1131 1132 /* 1133 * d_move() puts the renamed dentry at the end of 1134 * d_subdirs. We need to assign it an appropriate 1135 * directory offset so we can behave when dir is 1136 * complete. 1137 */ 1138 ceph_set_dentry_offset(req->r_old_dentry); 1139 dout("dn %p gets new offset %lld\n", req->r_old_dentry, 1140 ceph_dentry(req->r_old_dentry)->offset); 1141 1142 dn = req->r_old_dentry; /* use old_dentry */ 1143 } 1144 1145 /* null dentry? */ 1146 if (!rinfo->head->is_target) { 1147 dout("fill_trace null dentry\n"); 1148 if (dn->d_inode) { 1149 dout("d_delete %p\n", dn); 1150 d_delete(dn); 1151 } else { 1152 dout("d_instantiate %p NULL\n", dn); 1153 d_instantiate(dn, NULL); 1154 if (have_lease && d_unhashed(dn)) 1155 d_rehash(dn); 1156 update_dentry_lease(dn, rinfo->dlease, 1157 session, 1158 req->r_request_started); 1159 } 1160 goto done; 1161 } 1162 1163 /* attach proper inode */ 1164 if (!dn->d_inode) { 1165 ihold(in); 1166 dn = splice_dentry(dn, in, &have_lease, true); 1167 if (IS_ERR(dn)) { 1168 err = PTR_ERR(dn); 1169 goto done; 1170 } 1171 req->r_dentry = dn; /* may have spliced */ 1172 } else if (dn->d_inode && dn->d_inode != in) { 1173 dout(" %p links to %p %llx.%llx, not %llx.%llx\n", 1174 dn, dn->d_inode, ceph_vinop(dn->d_inode), 1175 ceph_vinop(in)); 1176 have_lease = false; 1177 } 1178 1179 if (have_lease) 1180 update_dentry_lease(dn, rinfo->dlease, session, 1181 req->r_request_started); 1182 dout(" final dn %p\n", dn); 1183 } else if (!req->r_aborted && 1184 (req->r_op == CEPH_MDS_OP_LOOKUPSNAP || 1185 req->r_op == CEPH_MDS_OP_MKSNAP)) { 1186 struct dentry *dn = req->r_dentry; 1187 1188 /* fill out a snapdir LOOKUPSNAP dentry */ 1189 BUG_ON(!dn); 1190 BUG_ON(!req->r_locked_dir); 1191 BUG_ON(ceph_snap(req->r_locked_dir) != CEPH_SNAPDIR); 1192 ininfo = rinfo->targeti.in; 1193 vino.ino = le64_to_cpu(ininfo->ino); 1194 vino.snap = le64_to_cpu(ininfo->snapid); 1195 dout(" linking snapped dir %p to dn %p\n", in, dn); 1196 ihold(in); 1197 dn = splice_dentry(dn, in, NULL, true); 1198 if (IS_ERR(dn)) { 1199 err = PTR_ERR(dn); 1200 goto done; 1201 } 1202 req->r_dentry = dn; /* may have spliced */ 1203 } 1204 done: 1205 dout("fill_trace done err=%d\n", err); 1206 return err; 1207 } 1208 1209 /* 1210 * Prepopulate our cache with readdir results, leases, etc. 1211 */ 1212 static int readdir_prepopulate_inodes_only(struct ceph_mds_request *req, 1213 struct ceph_mds_session *session) 1214 { 1215 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1216 int i, err = 0; 1217 1218 for (i = 0; i < rinfo->dir_nr; i++) { 1219 struct ceph_vino vino; 1220 struct inode *in; 1221 int rc; 1222 1223 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino); 1224 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid); 1225 1226 in = ceph_get_inode(req->r_dentry->d_sb, vino); 1227 if (IS_ERR(in)) { 1228 err = PTR_ERR(in); 1229 dout("new_inode badness got %d\n", err); 1230 continue; 1231 } 1232 rc = fill_inode(in, &rinfo->dir_in[i], NULL, session, 1233 req->r_request_started, -1, 1234 &req->r_caps_reservation); 1235 if (rc < 0) { 1236 pr_err("fill_inode badness on %p got %d\n", in, rc); 1237 err = rc; 1238 continue; 1239 } 1240 } 1241 1242 return err; 1243 } 1244 1245 int ceph_readdir_prepopulate(struct ceph_mds_request *req, 1246 struct ceph_mds_session *session) 1247 { 1248 struct dentry *parent = req->r_dentry; 1249 struct ceph_mds_reply_info_parsed *rinfo = &req->r_reply_info; 1250 struct qstr dname; 1251 struct dentry *dn; 1252 struct inode *in; 1253 int err = 0, ret, i; 1254 struct inode *snapdir = NULL; 1255 struct ceph_mds_request_head *rhead = req->r_request->front.iov_base; 1256 struct ceph_dentry_info *di; 1257 u64 r_readdir_offset = req->r_readdir_offset; 1258 u32 frag = le32_to_cpu(rhead->args.readdir.frag); 1259 1260 if (rinfo->dir_dir && 1261 le32_to_cpu(rinfo->dir_dir->frag) != frag) { 1262 dout("readdir_prepopulate got new frag %x -> %x\n", 1263 frag, le32_to_cpu(rinfo->dir_dir->frag)); 1264 frag = le32_to_cpu(rinfo->dir_dir->frag); 1265 if (ceph_frag_is_leftmost(frag)) 1266 r_readdir_offset = 2; 1267 else 1268 r_readdir_offset = 0; 1269 } 1270 1271 if (req->r_aborted) 1272 return readdir_prepopulate_inodes_only(req, session); 1273 1274 if (le32_to_cpu(rinfo->head->op) == CEPH_MDS_OP_LSSNAP) { 1275 snapdir = ceph_get_snapdir(parent->d_inode); 1276 parent = d_find_alias(snapdir); 1277 dout("readdir_prepopulate %d items under SNAPDIR dn %p\n", 1278 rinfo->dir_nr, parent); 1279 } else { 1280 dout("readdir_prepopulate %d items under dn %p\n", 1281 rinfo->dir_nr, parent); 1282 if (rinfo->dir_dir) 1283 ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir); 1284 } 1285 1286 /* FIXME: release caps/leases if error occurs */ 1287 for (i = 0; i < rinfo->dir_nr; i++) { 1288 struct ceph_vino vino; 1289 1290 dname.name = rinfo->dir_dname[i]; 1291 dname.len = rinfo->dir_dname_len[i]; 1292 dname.hash = full_name_hash(dname.name, dname.len); 1293 1294 vino.ino = le64_to_cpu(rinfo->dir_in[i].in->ino); 1295 vino.snap = le64_to_cpu(rinfo->dir_in[i].in->snapid); 1296 1297 retry_lookup: 1298 dn = d_lookup(parent, &dname); 1299 dout("d_lookup on parent=%p name=%.*s got %p\n", 1300 parent, dname.len, dname.name, dn); 1301 1302 if (!dn) { 1303 dn = d_alloc(parent, &dname); 1304 dout("d_alloc %p '%.*s' = %p\n", parent, 1305 dname.len, dname.name, dn); 1306 if (dn == NULL) { 1307 dout("d_alloc badness\n"); 1308 err = -ENOMEM; 1309 goto out; 1310 } 1311 ret = ceph_init_dentry(dn); 1312 if (ret < 0) { 1313 dput(dn); 1314 err = ret; 1315 goto out; 1316 } 1317 } else if (dn->d_inode && 1318 (ceph_ino(dn->d_inode) != vino.ino || 1319 ceph_snap(dn->d_inode) != vino.snap)) { 1320 dout(" dn %p points to wrong inode %p\n", 1321 dn, dn->d_inode); 1322 d_delete(dn); 1323 dput(dn); 1324 goto retry_lookup; 1325 } else { 1326 /* reorder parent's d_subdirs */ 1327 spin_lock(&parent->d_lock); 1328 spin_lock_nested(&dn->d_lock, DENTRY_D_LOCK_NESTED); 1329 list_move(&dn->d_u.d_child, &parent->d_subdirs); 1330 spin_unlock(&dn->d_lock); 1331 spin_unlock(&parent->d_lock); 1332 } 1333 1334 /* inode */ 1335 if (dn->d_inode) { 1336 in = dn->d_inode; 1337 } else { 1338 in = ceph_get_inode(parent->d_sb, vino); 1339 if (IS_ERR(in)) { 1340 dout("new_inode badness\n"); 1341 d_drop(dn); 1342 dput(dn); 1343 err = PTR_ERR(in); 1344 goto out; 1345 } 1346 } 1347 1348 if (fill_inode(in, &rinfo->dir_in[i], NULL, session, 1349 req->r_request_started, -1, 1350 &req->r_caps_reservation) < 0) { 1351 pr_err("fill_inode badness on %p\n", in); 1352 if (!dn->d_inode) 1353 iput(in); 1354 d_drop(dn); 1355 goto next_item; 1356 } 1357 1358 if (!dn->d_inode) { 1359 dn = splice_dentry(dn, in, NULL, false); 1360 if (IS_ERR(dn)) { 1361 err = PTR_ERR(dn); 1362 dn = NULL; 1363 goto next_item; 1364 } 1365 } 1366 1367 di = dn->d_fsdata; 1368 di->offset = ceph_make_fpos(frag, i + r_readdir_offset); 1369 1370 update_dentry_lease(dn, rinfo->dir_dlease[i], 1371 req->r_session, 1372 req->r_request_started); 1373 next_item: 1374 if (dn) 1375 dput(dn); 1376 } 1377 if (err == 0) 1378 req->r_did_prepopulate = true; 1379 1380 out: 1381 if (snapdir) { 1382 iput(snapdir); 1383 dput(parent); 1384 } 1385 dout("readdir_prepopulate done\n"); 1386 return err; 1387 } 1388 1389 int ceph_inode_set_size(struct inode *inode, loff_t size) 1390 { 1391 struct ceph_inode_info *ci = ceph_inode(inode); 1392 int ret = 0; 1393 1394 spin_lock(&ci->i_ceph_lock); 1395 dout("set_size %p %llu -> %llu\n", inode, inode->i_size, size); 1396 inode->i_size = size; 1397 inode->i_blocks = (size + (1 << 9) - 1) >> 9; 1398 1399 /* tell the MDS if we are approaching max_size */ 1400 if ((size << 1) >= ci->i_max_size && 1401 (ci->i_reported_size << 1) < ci->i_max_size) 1402 ret = 1; 1403 1404 spin_unlock(&ci->i_ceph_lock); 1405 return ret; 1406 } 1407 1408 /* 1409 * Write back inode data in a worker thread. (This can't be done 1410 * in the message handler context.) 1411 */ 1412 void ceph_queue_writeback(struct inode *inode) 1413 { 1414 ihold(inode); 1415 if (queue_work(ceph_inode_to_client(inode)->wb_wq, 1416 &ceph_inode(inode)->i_wb_work)) { 1417 dout("ceph_queue_writeback %p\n", inode); 1418 } else { 1419 dout("ceph_queue_writeback %p failed\n", inode); 1420 iput(inode); 1421 } 1422 } 1423 1424 static void ceph_writeback_work(struct work_struct *work) 1425 { 1426 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1427 i_wb_work); 1428 struct inode *inode = &ci->vfs_inode; 1429 1430 dout("writeback %p\n", inode); 1431 filemap_fdatawrite(&inode->i_data); 1432 iput(inode); 1433 } 1434 1435 /* 1436 * queue an async invalidation 1437 */ 1438 void ceph_queue_invalidate(struct inode *inode) 1439 { 1440 ihold(inode); 1441 if (queue_work(ceph_inode_to_client(inode)->pg_inv_wq, 1442 &ceph_inode(inode)->i_pg_inv_work)) { 1443 dout("ceph_queue_invalidate %p\n", inode); 1444 } else { 1445 dout("ceph_queue_invalidate %p failed\n", inode); 1446 iput(inode); 1447 } 1448 } 1449 1450 /* 1451 * Invalidate inode pages in a worker thread. (This can't be done 1452 * in the message handler context.) 1453 */ 1454 static void ceph_invalidate_work(struct work_struct *work) 1455 { 1456 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1457 i_pg_inv_work); 1458 struct inode *inode = &ci->vfs_inode; 1459 u32 orig_gen; 1460 int check = 0; 1461 1462 mutex_lock(&ci->i_truncate_mutex); 1463 spin_lock(&ci->i_ceph_lock); 1464 dout("invalidate_pages %p gen %d revoking %d\n", inode, 1465 ci->i_rdcache_gen, ci->i_rdcache_revoking); 1466 if (ci->i_rdcache_revoking != ci->i_rdcache_gen) { 1467 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE)) 1468 check = 1; 1469 spin_unlock(&ci->i_ceph_lock); 1470 mutex_unlock(&ci->i_truncate_mutex); 1471 goto out; 1472 } 1473 orig_gen = ci->i_rdcache_gen; 1474 spin_unlock(&ci->i_ceph_lock); 1475 1476 truncate_inode_pages(inode->i_mapping, 0); 1477 1478 spin_lock(&ci->i_ceph_lock); 1479 if (orig_gen == ci->i_rdcache_gen && 1480 orig_gen == ci->i_rdcache_revoking) { 1481 dout("invalidate_pages %p gen %d successful\n", inode, 1482 ci->i_rdcache_gen); 1483 ci->i_rdcache_revoking--; 1484 check = 1; 1485 } else { 1486 dout("invalidate_pages %p gen %d raced, now %d revoking %d\n", 1487 inode, orig_gen, ci->i_rdcache_gen, 1488 ci->i_rdcache_revoking); 1489 if (__ceph_caps_revoking_other(ci, NULL, CEPH_CAP_FILE_CACHE)) 1490 check = 1; 1491 } 1492 spin_unlock(&ci->i_ceph_lock); 1493 mutex_unlock(&ci->i_truncate_mutex); 1494 out: 1495 if (check) 1496 ceph_check_caps(ci, 0, NULL); 1497 iput(inode); 1498 } 1499 1500 1501 /* 1502 * called by trunc_wq; 1503 * 1504 * We also truncate in a separate thread as well. 1505 */ 1506 static void ceph_vmtruncate_work(struct work_struct *work) 1507 { 1508 struct ceph_inode_info *ci = container_of(work, struct ceph_inode_info, 1509 i_vmtruncate_work); 1510 struct inode *inode = &ci->vfs_inode; 1511 1512 dout("vmtruncate_work %p\n", inode); 1513 __ceph_do_pending_vmtruncate(inode); 1514 iput(inode); 1515 } 1516 1517 /* 1518 * Queue an async vmtruncate. If we fail to queue work, we will handle 1519 * the truncation the next time we call __ceph_do_pending_vmtruncate. 1520 */ 1521 void ceph_queue_vmtruncate(struct inode *inode) 1522 { 1523 struct ceph_inode_info *ci = ceph_inode(inode); 1524 1525 ihold(inode); 1526 1527 if (queue_work(ceph_sb_to_client(inode->i_sb)->trunc_wq, 1528 &ci->i_vmtruncate_work)) { 1529 dout("ceph_queue_vmtruncate %p\n", inode); 1530 } else { 1531 dout("ceph_queue_vmtruncate %p failed, pending=%d\n", 1532 inode, ci->i_truncate_pending); 1533 iput(inode); 1534 } 1535 } 1536 1537 /* 1538 * Make sure any pending truncation is applied before doing anything 1539 * that may depend on it. 1540 */ 1541 void __ceph_do_pending_vmtruncate(struct inode *inode) 1542 { 1543 struct ceph_inode_info *ci = ceph_inode(inode); 1544 u64 to; 1545 int wrbuffer_refs, finish = 0; 1546 1547 mutex_lock(&ci->i_truncate_mutex); 1548 retry: 1549 spin_lock(&ci->i_ceph_lock); 1550 if (ci->i_truncate_pending == 0) { 1551 dout("__do_pending_vmtruncate %p none pending\n", inode); 1552 spin_unlock(&ci->i_ceph_lock); 1553 mutex_unlock(&ci->i_truncate_mutex); 1554 return; 1555 } 1556 1557 /* 1558 * make sure any dirty snapped pages are flushed before we 1559 * possibly truncate them.. so write AND block! 1560 */ 1561 if (ci->i_wrbuffer_ref_head < ci->i_wrbuffer_ref) { 1562 dout("__do_pending_vmtruncate %p flushing snaps first\n", 1563 inode); 1564 spin_unlock(&ci->i_ceph_lock); 1565 filemap_write_and_wait_range(&inode->i_data, 0, 1566 inode->i_sb->s_maxbytes); 1567 goto retry; 1568 } 1569 1570 /* there should be no reader or writer */ 1571 WARN_ON_ONCE(ci->i_rd_ref || ci->i_wr_ref); 1572 1573 to = ci->i_truncate_size; 1574 wrbuffer_refs = ci->i_wrbuffer_ref; 1575 dout("__do_pending_vmtruncate %p (%d) to %lld\n", inode, 1576 ci->i_truncate_pending, to); 1577 spin_unlock(&ci->i_ceph_lock); 1578 1579 truncate_inode_pages(inode->i_mapping, to); 1580 1581 spin_lock(&ci->i_ceph_lock); 1582 if (to == ci->i_truncate_size) { 1583 ci->i_truncate_pending = 0; 1584 finish = 1; 1585 } 1586 spin_unlock(&ci->i_ceph_lock); 1587 if (!finish) 1588 goto retry; 1589 1590 mutex_unlock(&ci->i_truncate_mutex); 1591 1592 if (wrbuffer_refs == 0) 1593 ceph_check_caps(ci, CHECK_CAPS_AUTHONLY, NULL); 1594 1595 wake_up_all(&ci->i_cap_wq); 1596 } 1597 1598 /* 1599 * symlinks 1600 */ 1601 static void *ceph_sym_follow_link(struct dentry *dentry, struct nameidata *nd) 1602 { 1603 struct ceph_inode_info *ci = ceph_inode(dentry->d_inode); 1604 nd_set_link(nd, ci->i_symlink); 1605 return NULL; 1606 } 1607 1608 static const struct inode_operations ceph_symlink_iops = { 1609 .readlink = generic_readlink, 1610 .follow_link = ceph_sym_follow_link, 1611 .setattr = ceph_setattr, 1612 .getattr = ceph_getattr, 1613 .setxattr = ceph_setxattr, 1614 .getxattr = ceph_getxattr, 1615 .listxattr = ceph_listxattr, 1616 .removexattr = ceph_removexattr, 1617 .get_acl = ceph_get_acl, 1618 }; 1619 1620 /* 1621 * setattr 1622 */ 1623 int ceph_setattr(struct dentry *dentry, struct iattr *attr) 1624 { 1625 struct inode *inode = dentry->d_inode; 1626 struct ceph_inode_info *ci = ceph_inode(inode); 1627 struct inode *parent_inode; 1628 const unsigned int ia_valid = attr->ia_valid; 1629 struct ceph_mds_request *req; 1630 struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc; 1631 int issued; 1632 int release = 0, dirtied = 0; 1633 int mask = 0; 1634 int err = 0; 1635 int inode_dirty_flags = 0; 1636 1637 if (ceph_snap(inode) != CEPH_NOSNAP) 1638 return -EROFS; 1639 1640 err = inode_change_ok(inode, attr); 1641 if (err != 0) 1642 return err; 1643 1644 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETATTR, 1645 USE_AUTH_MDS); 1646 if (IS_ERR(req)) 1647 return PTR_ERR(req); 1648 1649 spin_lock(&ci->i_ceph_lock); 1650 issued = __ceph_caps_issued(ci, NULL); 1651 dout("setattr %p issued %s\n", inode, ceph_cap_string(issued)); 1652 1653 if (ia_valid & ATTR_UID) { 1654 dout("setattr %p uid %d -> %d\n", inode, 1655 from_kuid(&init_user_ns, inode->i_uid), 1656 from_kuid(&init_user_ns, attr->ia_uid)); 1657 if (issued & CEPH_CAP_AUTH_EXCL) { 1658 inode->i_uid = attr->ia_uid; 1659 dirtied |= CEPH_CAP_AUTH_EXCL; 1660 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1661 !uid_eq(attr->ia_uid, inode->i_uid)) { 1662 req->r_args.setattr.uid = cpu_to_le32( 1663 from_kuid(&init_user_ns, attr->ia_uid)); 1664 mask |= CEPH_SETATTR_UID; 1665 release |= CEPH_CAP_AUTH_SHARED; 1666 } 1667 } 1668 if (ia_valid & ATTR_GID) { 1669 dout("setattr %p gid %d -> %d\n", inode, 1670 from_kgid(&init_user_ns, inode->i_gid), 1671 from_kgid(&init_user_ns, attr->ia_gid)); 1672 if (issued & CEPH_CAP_AUTH_EXCL) { 1673 inode->i_gid = attr->ia_gid; 1674 dirtied |= CEPH_CAP_AUTH_EXCL; 1675 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1676 !gid_eq(attr->ia_gid, inode->i_gid)) { 1677 req->r_args.setattr.gid = cpu_to_le32( 1678 from_kgid(&init_user_ns, attr->ia_gid)); 1679 mask |= CEPH_SETATTR_GID; 1680 release |= CEPH_CAP_AUTH_SHARED; 1681 } 1682 } 1683 if (ia_valid & ATTR_MODE) { 1684 dout("setattr %p mode 0%o -> 0%o\n", inode, inode->i_mode, 1685 attr->ia_mode); 1686 if (issued & CEPH_CAP_AUTH_EXCL) { 1687 inode->i_mode = attr->ia_mode; 1688 dirtied |= CEPH_CAP_AUTH_EXCL; 1689 } else if ((issued & CEPH_CAP_AUTH_SHARED) == 0 || 1690 attr->ia_mode != inode->i_mode) { 1691 inode->i_mode = attr->ia_mode; 1692 req->r_args.setattr.mode = cpu_to_le32(attr->ia_mode); 1693 mask |= CEPH_SETATTR_MODE; 1694 release |= CEPH_CAP_AUTH_SHARED; 1695 } 1696 } 1697 1698 if (ia_valid & ATTR_ATIME) { 1699 dout("setattr %p atime %ld.%ld -> %ld.%ld\n", inode, 1700 inode->i_atime.tv_sec, inode->i_atime.tv_nsec, 1701 attr->ia_atime.tv_sec, attr->ia_atime.tv_nsec); 1702 if (issued & CEPH_CAP_FILE_EXCL) { 1703 ci->i_time_warp_seq++; 1704 inode->i_atime = attr->ia_atime; 1705 dirtied |= CEPH_CAP_FILE_EXCL; 1706 } else if ((issued & CEPH_CAP_FILE_WR) && 1707 timespec_compare(&inode->i_atime, 1708 &attr->ia_atime) < 0) { 1709 inode->i_atime = attr->ia_atime; 1710 dirtied |= CEPH_CAP_FILE_WR; 1711 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1712 !timespec_equal(&inode->i_atime, &attr->ia_atime)) { 1713 ceph_encode_timespec(&req->r_args.setattr.atime, 1714 &attr->ia_atime); 1715 mask |= CEPH_SETATTR_ATIME; 1716 release |= CEPH_CAP_FILE_CACHE | CEPH_CAP_FILE_RD | 1717 CEPH_CAP_FILE_WR; 1718 } 1719 } 1720 if (ia_valid & ATTR_MTIME) { 1721 dout("setattr %p mtime %ld.%ld -> %ld.%ld\n", inode, 1722 inode->i_mtime.tv_sec, inode->i_mtime.tv_nsec, 1723 attr->ia_mtime.tv_sec, attr->ia_mtime.tv_nsec); 1724 if (issued & CEPH_CAP_FILE_EXCL) { 1725 ci->i_time_warp_seq++; 1726 inode->i_mtime = attr->ia_mtime; 1727 dirtied |= CEPH_CAP_FILE_EXCL; 1728 } else if ((issued & CEPH_CAP_FILE_WR) && 1729 timespec_compare(&inode->i_mtime, 1730 &attr->ia_mtime) < 0) { 1731 inode->i_mtime = attr->ia_mtime; 1732 dirtied |= CEPH_CAP_FILE_WR; 1733 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1734 !timespec_equal(&inode->i_mtime, &attr->ia_mtime)) { 1735 ceph_encode_timespec(&req->r_args.setattr.mtime, 1736 &attr->ia_mtime); 1737 mask |= CEPH_SETATTR_MTIME; 1738 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1739 CEPH_CAP_FILE_WR; 1740 } 1741 } 1742 if (ia_valid & ATTR_SIZE) { 1743 dout("setattr %p size %lld -> %lld\n", inode, 1744 inode->i_size, attr->ia_size); 1745 if (attr->ia_size > inode->i_sb->s_maxbytes) { 1746 err = -EINVAL; 1747 goto out; 1748 } 1749 if ((issued & CEPH_CAP_FILE_EXCL) && 1750 attr->ia_size > inode->i_size) { 1751 inode->i_size = attr->ia_size; 1752 inode->i_blocks = 1753 (attr->ia_size + (1 << 9) - 1) >> 9; 1754 inode->i_ctime = attr->ia_ctime; 1755 ci->i_reported_size = attr->ia_size; 1756 dirtied |= CEPH_CAP_FILE_EXCL; 1757 } else if ((issued & CEPH_CAP_FILE_SHARED) == 0 || 1758 attr->ia_size != inode->i_size) { 1759 req->r_args.setattr.size = cpu_to_le64(attr->ia_size); 1760 req->r_args.setattr.old_size = 1761 cpu_to_le64(inode->i_size); 1762 mask |= CEPH_SETATTR_SIZE; 1763 release |= CEPH_CAP_FILE_SHARED | CEPH_CAP_FILE_RD | 1764 CEPH_CAP_FILE_WR; 1765 } 1766 } 1767 1768 /* these do nothing */ 1769 if (ia_valid & ATTR_CTIME) { 1770 bool only = (ia_valid & (ATTR_SIZE|ATTR_MTIME|ATTR_ATIME| 1771 ATTR_MODE|ATTR_UID|ATTR_GID)) == 0; 1772 dout("setattr %p ctime %ld.%ld -> %ld.%ld (%s)\n", inode, 1773 inode->i_ctime.tv_sec, inode->i_ctime.tv_nsec, 1774 attr->ia_ctime.tv_sec, attr->ia_ctime.tv_nsec, 1775 only ? "ctime only" : "ignored"); 1776 inode->i_ctime = attr->ia_ctime; 1777 if (only) { 1778 /* 1779 * if kernel wants to dirty ctime but nothing else, 1780 * we need to choose a cap to dirty under, or do 1781 * a almost-no-op setattr 1782 */ 1783 if (issued & CEPH_CAP_AUTH_EXCL) 1784 dirtied |= CEPH_CAP_AUTH_EXCL; 1785 else if (issued & CEPH_CAP_FILE_EXCL) 1786 dirtied |= CEPH_CAP_FILE_EXCL; 1787 else if (issued & CEPH_CAP_XATTR_EXCL) 1788 dirtied |= CEPH_CAP_XATTR_EXCL; 1789 else 1790 mask |= CEPH_SETATTR_CTIME; 1791 } 1792 } 1793 if (ia_valid & ATTR_FILE) 1794 dout("setattr %p ATTR_FILE ... hrm!\n", inode); 1795 1796 if (dirtied) { 1797 inode_dirty_flags = __ceph_mark_dirty_caps(ci, dirtied); 1798 inode->i_ctime = CURRENT_TIME; 1799 } 1800 1801 release &= issued; 1802 spin_unlock(&ci->i_ceph_lock); 1803 1804 if (inode_dirty_flags) 1805 __mark_inode_dirty(inode, inode_dirty_flags); 1806 1807 if (ia_valid & ATTR_MODE) { 1808 err = ceph_acl_chmod(dentry, inode); 1809 if (err) 1810 goto out_put; 1811 } 1812 1813 if (mask) { 1814 req->r_inode = inode; 1815 ihold(inode); 1816 req->r_inode_drop = release; 1817 req->r_args.setattr.mask = cpu_to_le32(mask); 1818 req->r_num_caps = 1; 1819 parent_inode = ceph_get_dentry_parent_inode(dentry); 1820 err = ceph_mdsc_do_request(mdsc, parent_inode, req); 1821 iput(parent_inode); 1822 } 1823 dout("setattr %p result=%d (%s locally, %d remote)\n", inode, err, 1824 ceph_cap_string(dirtied), mask); 1825 1826 ceph_mdsc_put_request(req); 1827 if (mask & CEPH_SETATTR_SIZE) 1828 __ceph_do_pending_vmtruncate(inode); 1829 return err; 1830 out: 1831 spin_unlock(&ci->i_ceph_lock); 1832 out_put: 1833 ceph_mdsc_put_request(req); 1834 return err; 1835 } 1836 1837 /* 1838 * Verify that we have a lease on the given mask. If not, 1839 * do a getattr against an mds. 1840 */ 1841 int ceph_do_getattr(struct inode *inode, int mask) 1842 { 1843 struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); 1844 struct ceph_mds_client *mdsc = fsc->mdsc; 1845 struct ceph_mds_request *req; 1846 int err; 1847 1848 if (ceph_snap(inode) == CEPH_SNAPDIR) { 1849 dout("do_getattr inode %p SNAPDIR\n", inode); 1850 return 0; 1851 } 1852 1853 dout("do_getattr inode %p mask %s mode 0%o\n", inode, ceph_cap_string(mask), inode->i_mode); 1854 if (ceph_caps_issued_mask(ceph_inode(inode), mask, 1)) 1855 return 0; 1856 1857 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 1858 if (IS_ERR(req)) 1859 return PTR_ERR(req); 1860 req->r_inode = inode; 1861 ihold(inode); 1862 req->r_num_caps = 1; 1863 req->r_args.getattr.mask = cpu_to_le32(mask); 1864 err = ceph_mdsc_do_request(mdsc, NULL, req); 1865 ceph_mdsc_put_request(req); 1866 dout("do_getattr result=%d\n", err); 1867 return err; 1868 } 1869 1870 1871 /* 1872 * Check inode permissions. We verify we have a valid value for 1873 * the AUTH cap, then call the generic handler. 1874 */ 1875 int ceph_permission(struct inode *inode, int mask) 1876 { 1877 int err; 1878 1879 if (mask & MAY_NOT_BLOCK) 1880 return -ECHILD; 1881 1882 err = ceph_do_getattr(inode, CEPH_CAP_AUTH_SHARED); 1883 1884 if (!err) 1885 err = generic_permission(inode, mask); 1886 return err; 1887 } 1888 1889 /* 1890 * Get all attributes. Hopefully somedata we'll have a statlite() 1891 * and can limit the fields we require to be accurate. 1892 */ 1893 int ceph_getattr(struct vfsmount *mnt, struct dentry *dentry, 1894 struct kstat *stat) 1895 { 1896 struct inode *inode = dentry->d_inode; 1897 struct ceph_inode_info *ci = ceph_inode(inode); 1898 int err; 1899 1900 err = ceph_do_getattr(inode, CEPH_STAT_CAP_INODE_ALL); 1901 if (!err) { 1902 generic_fillattr(inode, stat); 1903 stat->ino = ceph_translate_ino(inode->i_sb, inode->i_ino); 1904 if (ceph_snap(inode) != CEPH_NOSNAP) 1905 stat->dev = ceph_snap(inode); 1906 else 1907 stat->dev = 0; 1908 if (S_ISDIR(inode->i_mode)) { 1909 if (ceph_test_mount_opt(ceph_sb_to_client(inode->i_sb), 1910 RBYTES)) 1911 stat->size = ci->i_rbytes; 1912 else 1913 stat->size = ci->i_files + ci->i_subdirs; 1914 stat->blocks = 0; 1915 stat->blksize = 65536; 1916 } 1917 } 1918 return err; 1919 } 1920